Time-Dependent Mass Transport for O2 Reduction at the Pt   Perfluorosulfonic Acid Ionomer Interface

2014 ◽  
Vol 4 (1) ◽  
pp. F9-F12 ◽  
Author(s):  
D. Novitski ◽  
Z. Xie ◽  
S. Holdcroft
Keyword(s):  
Mass Transport ◽  
Time Dependent ◽  
Perfluorosulfonic Acid ◽  
O2 Reduction ◽  
Dependent Mass

On the Quantization Problem of a Driven Harmonic Oscillator with Time Dependent Mass and Frequency

2003 ◽  
Vol 17 (18) ◽  
pp. 983-990 ◽  
Author(s):  
Swapan Mandal
Keyword(s):  
Harmonic Oscillator ◽  
Time Dependent ◽  
Present Solution ◽  
Quadratic Hamiltonian ◽  
Dependent Mass ◽  
Quantization Problem

The quantization of a driven harmonic oscillator with time dependent mass and frequency (DHTDMF) is considered. We observe that the driven term has no influence on the quantization of the oscillator. It is found that the DHTDMF corresponds the general quadratic Hamiltonian. The present solution is critically compared with existing solutions of DHTDMF.

Time-dependent mass spectra and breakdown graphs. 17. Naphthalene and phenanthrene

1993 ◽  
Vol 97 (47) ◽  
pp. 12282-12290 ◽  
Author(s):  
Yehiel Gotkis ◽  
Maria Oleinikova ◽  
Mor Naor ◽  
Chava Lifshitz
Keyword(s):  
Mass Spectra ◽  
Time Dependent ◽  
Dependent Mass

Morphology-dependent mass transport model for mechanoelectrochemistry of polypyrrole

2018 ◽  
Vol 28 (1) ◽  
pp. 015001 ◽  
Author(s):  
Vijay Venkatesh ◽  
Noriko Katsube ◽  
Vishnu Baba Sundaresan
Keyword(s):  
Mass Transport ◽  
Transport Model ◽  
Mass Transport Model ◽  
Dependent Mass

scholarly journals Integrals of the motion and green functions for time-dependent mass harmonic oscillators

2018 ◽  
Vol 64 (1) ◽  
pp. 30
Author(s):  
Surarit Pepore
Keyword(s):  
Harmonic Oscillator ◽  
Harmonic Oscillators ◽  
Time Dependent ◽  
Green Functions ◽  
Feynman Path Integral ◽  
Feynman Path ◽  
Damped Harmonic Oscillator ◽  
System Trajectory ◽  
Dependent Mass ◽  
Motion Method

The application of the integrals of the motion of a quantum system in deriving Green function or propagator is established. The Greenfunction is shown to be the eigenfunction of the integrals of the motion which described initial points of the system trajectory in the phasespace. The explicit expressions for the Green functions of the damped harmonic oscillator, the harmonic oscillator with strongly pulsatingmass, and the harmonic oscillator with mass growing with time are obtained in co-ordinate representations. The connection between theintegrals of the motion method and other method such as Feynman path integral and Schwinger method are also discussed.

Numerical Simulations of Riser Gas Behavior in Non-Aqueous Muds Using a Modified Drift Flux Model

2019 ◽  
Author(s):  
Nnamdi Nwaka ◽  
Yuanhang Chen
Keyword(s):  
Mass Transfer ◽  
Gas Phase ◽  
Time Dependent ◽  
Recent Experimental Data ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Transient Nature ◽  
Mass Transfer Processes ◽  
Flux Model ◽  
Dependent Mass

Abstract Real-time prediction of riser gas behavior is of great importance in well control. Single bubble models have, thus far, been used to describe gas-in-riser events and define riser equilibrium. These models have however not considered the transient nature of desorption of gas influx from non-aqueous fluids (NAFs) during migration or circulation in a riser. This paper uses a modified drift-flux model (DFM) to more properly describe gas-in-riser events by incorporating time-dependent mass transfer processes in NAFs. In this paper, we modified the DFM to account for the gas-liquid mass transfer due to the time dependent desorption of the gas phase. The advection upstream splitting model (AUSMV) hybrid scheme was used to solve the model. The time dependent mass transfer is calculated using a kinetic model developed based on recent experimental data. The capability of this model to improve riser gas management is demonstrated using a case study and the simulations are compared to when mass transfer between gas influx and NAF is not considered. Results also show that the severity of unloading and depth of the riser equilibrium can be underestimated if a time dependent desorption is not considered. The concept of riser equilibrium has been, thus far, developed without due consideration of mass transport of gas phase in the mud. This paper factors in the time-dependent desorption of the gas phase in the mud for a more realistic prediction of riser gas unloading events.

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